Hello, how are you.
How can I make the following condition in a .tex (main) document:
if..., then..., else...?
For example, I have this:
%...
\input{pack.tex}
%...
But, the problem: it never will be available. So, I pretend to use
if..., then,... else... for no allowing LaTeX to make an error as
follow as:
if "pack.tex" exists, then input (include) it, else ignore it.
I hope an answer as soon as you read this, please.
Thank you, very much.
Have a good day.
-HRE
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